Everyone has to shoot the same stage. I'm down for anything. It is all practical. We are fat, skinny, tall, short, fast, and slow. It's not like every stage has a prone position. It's part of the mix, don't take it away! I'm tall, and there are much low ports for short shooters, advantage for them, so what ?! I'm not going too accommodate one bad knee. That bad knee could be a scenario. No one is forcing the bad knee to shoot.
There's is Bullseye , Trap , or Skeet if you want to "stand-n-shoot" in one spot.